Out and about: Subsequent memory effect captured in a natural outdoor environment with smartphone EEG
Out and about: Subsequent memory effect captured in a natural outdoor environment with smartphone EEG
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DOI：
10.1111/psyp.13331
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发表时间：
2019-05-01
期刊：
影响因子：
3.7
通讯作者：
Debener, Stefan
中科院分区：
文献类型：
--
作者：
Salvidegoitia, Maria Pineyro;Jacobsen, Nadine;Debener, Stefan
时空背景在情景记忆中起着重要的作用。虽然在实验室中经常研究时间背景效应，但在静止条件下难以实现生态有效的空间背景操纵。我们研究了成功编码（后续记忆效应）的神经相关性是否可以在真实世界的环境中被捕获。使用现成的Android智能手机进行无线移动的EEG采集和刺激呈现。参与者对单个单词进行编码，每个单词都在大学校园的不同位置呈现。地点彼此相距约10- 12米，其中一半附近有引人注目的特征（地标）。我们预测地标会提高回忆性能。在第一次自由回忆任务的口头刺激室内，参与者进行了随后的回忆户外，在其中的话和地点被召回。正如所预测的那样，在地标位置呈现的单词显着更多，以及显着更多的地标比nonlandmark位置被召回。与400- 800 ms间隔中的未命中相比，ERP分析在命中编码期间产生了更大的后向正偏转。同样地，时间-频率分析显示，与未命中相比，命中编码期间的显著差异表现为更强的α（200- 300 ms）和θ（300- 400 ms）功率增加。我们的研究结果证实，一个充满活力的空间背景是有益的情景记忆处理和潜在的神经相关可以捕获与不引人注目的智能手机脑电图技术。移动的EEG技术的出现有望揭示自然体力活动和自然环境对记忆的相关性。本研究是第一个使用智能手机移动的EEG来捕获真实的世界中成功记忆形成的神经相关性。参与者在室外校园位置编码单词，同时进行智能手机EEG记录。至关重要的是，我们的编码设置非常类似于日常情景记忆体验，为每个编码刺激提供了独特的时间和空间背景，从而克服了固定实验室设置的不变空间背景。此外，我们能够探索功能丰富的位置（地标）对情景记忆表现的积极影响。移动的脑电图技术的出现有望揭示自然环境对记忆的相关性。
Spatiotemporal context plays an important role in episodic memory. While temporal context effects have been frequently studied in the laboratory, ecologically valid spatial context manipulations are difficult to implement in stationary conditions. We investigated whether the neural correlates of successful encoding (subsequent memory effect) can be captured in a real-world environment. An off-the-shelf Android smartphone was used for wireless mobile EEG acquisition and stimulus presentation. Participants encoded single words, each of which was presented at a different location on a university campus. Locations were approximately 10-12m away from each other, half of them with striking features (landmarks) nearby. We predicted landmarks would improve recall performance. After a first free recall task of verbal stimuli indoors, participants performed a subsequent recall outdoors, in which words and locations were recalled. As predicted, significantly more words presented at landmark locations as well as significantly more landmark than nonlandmark locations were recalled. ERP analysis yielded a larger posterior positive deflection during encoding for hits compared to misses in the 400-800ms interval. Likewise, time-frequency analysis revealed a significant difference during encoding for hits compared to misses in the form of stronger alpha (200-300ms) and theta (300-400ms) power increases. Our results confirm that a vibrant spatial context is beneficial in episodic memory processing and that the underlying neural correlates can be captured with unobtrusive smartphone EEG technology. The advent of mobile EEG technology promises to unveil the relevance of natural physical activity and natural environments on memory.This study is the first to use smartphone mobile EEG to capture neural correlates of successful memory formation in the real world. Participants encoded words at outdoor campus locations while on smartphone EEG recording. Crucially, our encoding setting closely resembled the day-to-day episodic memory experience, by providing a unique temporal and spatial context for every encoding stimulus, thereby overcoming the invariant spatial context of stationary laboratory settings. Further, we were able to explore the positive impact of feature-rich locations (landmarks) on episodic memory performance. The advent of mobile EEG technology promises to unveil the relevance of natural environments on memory.